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When the voltage and frequency are within the tolerance
range once more, the rectifier and the battery charger switch
back on automatically. The rectifier then continues supplying
the inverter and the battery charger takes over charging the
battery.
5.3.3 Bypass Operation
If the inverter is overloaded or if overtemperature is detected,
e.g. also if an inverter defect is detected, voltage is supplied
to the load via the bypass that switches on automatically. This
is signalled by the bypass symbol.
This function is also referred to as passive redundancy. It
protects against total failure of the voltage supply on the
protected busbar, however in the operating status that is now
attained, mains faults would have a direct effect on the load.
As a result, the electronics continuously attempt to switch
back to "online" / normal operating status (e.g. when the
overload or overtemperature no longer applies).
Bypass
Line Inverter
Battery
The bypass is a mechanical link that switches extremely
rapidly. It is located between the load and the mains. The
synchronisation unit ensures that the frequency and phase of
the inverter voltage is synchronised with the mains.
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REC
Battery
charger
INV
Autom.
bypass
Safety busbar:
Load
Mains
Battery
Power circuit with
faulty inverter
Diagram